In Catholic tradition, the Old Testament is divided into three main parts: the Law, the Prophets, and the Writings.
The Law, also known as the Pentateuch or the Torah, consists of the first five books of the Old Testament - Genesis, Exodus, Leviticus, Numbers, and Deuteronomy. These books contain the laws and commandments that God gave to the Israelites, as well as the story of their deliverance from slavery in Egypt and their journey to the promised land.
The Prophets consists of the books of the Old Testament that contain the writings of the prophets, who were individuals called by God to speak on his behalf and to warn the Israelites about their wrongdoing and the consequences of their sins. This section of the Old Testament includes the books of Isaiah, Jeremiah, Ezekiel, and other prophetic books. The Writings, also known as the Ketuvim, consists of a diverse collection of books that includes poetry, wisdom literature, and other writings. This section of the Old Testament includes the books of Psalms, Proverbs, Job, and other writings.
Together, these three parts of the Old Testament - the Law, the Prophets, and the Writings - form a complete and cohesive whole, and are considered to be an essential part of the Catholic canon of scripture. They are a rich source of divine revelation and guidance, and continue to be studied and revered by Catholics around the world.